Support diag_embed.out decomposition (#88671)
This is a little tricky: there is a diag_embed.out, but its not bound
in Python because it's autogenerated, see https://github.com/pytorch/pytorch/issues/88598
So I can't "just" add the out variant to the ref, as this makes it
inconsistent with the torch API. To workaround this, I mark the ref
as supporting out, but not the original function.
This is useful to do, because it means that diag_embed.out now supports
symbolic shapes. However, this cannot be easily tested because
I can't mark the out variant as being supported in the normal OpInfo test.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88671
Approved by: https://github.com/mruberry
